Class
2nd YEAR Federal Board 2009
Paper:Chemistry (Objective Type) Time
Allowed: Max.Marks:
Note:Use this paper
to write the answers to the objective questions.No marks will be awarded
for cutting,over-writing
or using a pencil.This paper must be tagged with the answer-book.
1. Insert correct option.
(1) Which statement about elements in
the periodic table is correct ?
(a)
Group zero elements are unreactive metals
(b)
Groups I-A elements form covalent chlorides
(c) The
melting point of elements in group VII-A decrease with atomic number
(d)
Hydration energy increases significantly from left to right
in a period
(2) The element Cs is in the same
group of periodic table as Na and K.Which of the following is
likely to
be the property of Cesium?
(a)
It does not conduct electricity
(b)
It forms an insoluble hydroxide
(c)
It react vigorously with hydrogen at room temperature
(d)
It forms an ionic chloride of formula CsCl 2
3) In the commercial preparation
of sodium hydroxide by the diaphragm cell the level of brine in
anode
compartment is kept slightly higher so as to.
(a) Separate
the two solution while allowing sodium ions to move towards cathode.
(b)
Keep the direction of flow of liquid towards cathode
(c) Keep
the direction of flow of liquid towards anode
(d) Prevent
the oxygen gas from reacting with chlorine
(4)
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Experiment
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Halogen dded
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Nax
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NaY
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NaZ
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1
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X 2
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............
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Y2
displaced
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Z 2 displaced
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2
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Y 2
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No reaction
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............
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No reaction
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3
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Z 2
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No reaction
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Y2 displaced
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..........
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What were
the halogens X, Y, Z added?
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X
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Y
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Z
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A
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Bromine
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Chlorine
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lodine
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B
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Bromine
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lodine
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Chlorine
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C
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Chlorine
|
lodine
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Bromine
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D
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Chlorine
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Bromine
|
lodine
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(5) Choose the correct products for the
reaction between concentrated nitric acid and tin.
(a)
Sn + HNO 3 ---> Sn(NO3)2 + NH4 NO3 + H2O
(b)
Sn + HNO 3 ---> H2 SnO3 + NO 2 + H 2 O
(c)
Sn + HNO 3 ---> Sn(NO3)2 + NO2 + H 2 O
(d)
Sn + HNO 3 ---> H2SnO3 + N2O + H2 O
(6) Steel can be protected from rusting
by spraying it with Zinc. Zn is used because.
(a)
Zn has a high melting point so it does not corrode easily
(b)
Zn does not react with acidic exhaust fumes
(c)
Zn forms a stable compound with iron
(d)
Zn is higher in reactivity series than iron
(7)
(8) Synthetic rubber is obtained when.
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(a) Acetylene is passed in the ammonical solution
of cuprous chloride
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(b) Acetylene is passed in the acidic solution of
cuprous chloride and then concentrated HCl is added
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(c) Acetylene is passed through a copper tube at
300 c
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(d) Acetylene is reacted with HCN in the ammonical
solution of cuprous chloride at higher temperature
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(9) R - Mg - X + Y----> A compound
----H30---> tertairy alcohol. What compound is Y ?
(a) Carbon dioxide
(b) Ketone
(c) Aldehyde
(d) Ethylene epoxide
(10) ROH + R1 COOH
R1 COOR + H 2 O
The order of
reactivity of alcohols in the above case is.
(a) Ter-alcohol
> Sec-alcohol > Primaryalcohol
(b) Primary
alcohol> Sec-alcohol > Ter-alcohol
(c) CH3OH>
Primaryalcohol> Ter-alcohol>Sec-alcohol
(d) Sec-alcohol
> Primary alcohol> Ter-alcohol
(11) Butanone when oxidized in the presence of acidified
potassium dichromate given the following products.
(a) CH3COOH
+ CH3COOH
(b) HCOOH + CH3CH2COOH
(c) CH3COCH3
+ HCOOH (d)
CH3CH2CH2COOH only
(12) Which set of the following steps give exact
sequence of processes that are involved in the conversion
of acetylene into acetic acid?
(a)
Hydration,Oxidation,Rearrangement
(b) Rearrangement,Hydration,Oxidation
(c) Hydration,Rearrangement,Oxidation
(d) Oxidation,Hydration,Rearrangement
(13) Which of the fertilizer does not make the soil
acidic ?
(a) Ammonium
nitrate (b)
Pottasium nitrate
(c)
Calcium cyanamide
(d) Urea
(14) Which property is Not shown by the pollutant
peroxy acetyl nitrate?
(a)
A main component of photo chemical smog (b) It
is an eye irritant
(c) It
is toxic to plants
(d) It is harmful for fish as it clogs the gills causing suffocation
(15) Which formula of the following functional groups
is called as ''lmino Group''?
Attempt
any FOURTEEN parts.
(1) Sodium metal is commercially prepared
by Down's cell.
(a) Are there
any advantages of this method? What are the production?
(b) In the above
method electrolysis of fused sodium chloride is carried out,why
not aqueous solution
of sodium chloride used instead? Give reasons.
(2) Colemanite is an ore of Boric Acid.
(a) Describe
the commercial preparation of boric acid from the above ore with
equations.
(b) Boric acid
has many different interconvertible forms at different temperatures.
Give equations to show
these changes.
(3) There are two important oxy acids
of Nitrogen.
(a) Write
down the electronic structure of nitrous acid.
(b) Explain
the manufacturing process of nitric acid by Birkland and Eyde's
process with diagram and
equations.
(4) (a) KMnO4 is a purple coloured compound
and Ti gives a solution [ Ti(H2O)6]+3 ions,which looks
violet in colour.Explain the reason behind the colours development
of these compounds.
(b) Name
the compound [CO(NH3)6]Cl3 and draw its structure and also name
the type of hybridization
taking place in the complex.
(5) Compounds of halogens have many commercial
uses.
(a) The term
''Available chlorine'' is often used for the bleaching powder.Explain
the term while giving
an equation.
(b) Hydrogen
fluoride occurs in different state than other hydrogen halides at
room temperature . Explain
the reason and also justify the statement that its viscosity is
less than that of water.
(c) Write down
the commercial uses of bromine.
(6) An organic compound has the molecular
formula C4H8 which on ozonolysis gave three different products.
(a) Write equations
for the ozonolysis.
(b) Name the
types of isomerisms present in the compound C4H8.
(7) (a) What is halogenonium ion? How
is it produced ? Describe the mechanism when this species attacks
on benzene ring.
(b) What products
are obtained by the nitration of bromo benzene? State the reason
behind the formation
of these products.
(8) (a) Tertairy alkyl halides generally
follow E 1 mechanism, explain with the help of equations.
(b) What differents
products are obtained if tertiary alkyl halides undergo SN 1 mechanism
instead?
(c) What conditions
are required for the SN 1 mechanism?
(9) Only 20% gasoline is obtained by
the fractionall distillation of petroleum. Due to energy crisis
it is required
in large amount now days.
(a) Name the
process and also give equations,by which its high demand is met.
(b) What is
the standard of finding about the quality of fuel? Define it.
(c) How the
quality of a fuel can be improved? Name the procedure and give equations
for the process.
(10) Carbonyl compounds are reduced to their corresponding
alcohols by NaBH4 in ether solution. One of
each compounds is reduced to an alcohol which cannot be dehydrated
intramolecularly.
(a) Identify
the structure of the compound.
(b) Give equation
and mechanism of the reduction.
(c) Carbonyl
compounds can be oxidized. Give two different oxidation reactions
used to identify an aldehyde
from a ketone.
Describe and explain the changes you observe in these reactions.
(11) Polymers have an importance utility in our daily
life.
(a) Explain
the term ''Copolymer''.
(b) Based on
the thermal property of a polymer what type is epoxy resin?
(c) How is a
peptide linkage formed? What type of polymerization takes place
in this case?
(12) Nucleic acids have been discovered in this century.
(a) Define
''replication''
(b) What are
the differences between the two types of Nucleic acids DNA
and RNA
(c) Write the
structure of cellulose naming the type of linkage present of cellulose
naming the type of linkage
present in it.
(13) Paper and cement industries are the most demanded
ones now a days.
(a) Explain
the process of the digestion of pulp.
(b) The use
of cement in the construction of building is based in its property
of setting to a hardness. Describe
the reactions involved in the setting of cement in first 24 hours.
(14) (a) Why chlorination of water is a frequently
used method? Which compound is used to generate chlorine
and why? In what ways chlorination is not a very effective method.
(b) Define the
term ieachate. What are its components especially the micro pollutants?
(15) (a) Describe the commercial preparation of methanol
along with the labelled diagram.
(b) Arrange
the following compounds in order of their increasing acid strength,while
giving reasons.
C6H5COOH, C6H5OH, C2H5OH, H2O
(16) What trends of solubility and boiling points
are followed in the homologous series of carboxylic acids?
(17) Suggest the mechanism for the conversion of
acetaldehyde into lactic acid.
(18) How fertilizers are classified and what role
each type of fertilizer has?
(19) (a) Define modren periodic law.
(b) Justify
the position of hydrogen in the group l-A. Why hydrogen is a non-metal
in true sense?
3. Carbon and
Silicon are present in group IV-A.
(a) In what
respect they are different from the rest of the elements specially
mention the peculiar behaviour
of carbon.
(b) The simjplest
formula for silica is SiO2. Do you expect it to be a small symmetrical
and linear molecular
like CO2? If not then draw its structure and explain it.
(c) What are
silicones? How can we synthesize them?
(d) Write the
properties of the silicones and where are they used or have any
useful applications.
4. (a) Define
the term micro-nutrients and macronutrients.
(b) Describe
the manufacture of urea giving flow sheet diagram.
(c) Write the
structural formula of following compounds and name them according
to lUPAC system.
(i) Pthaiic
acid. (ii) Di-isopropyl
ether. (c) Acetal.
(d) What are
pesticides? What health problems can be caused by them if they are
used?
5. Hydrogenation
is a process used in the laboratory as well as in industry.
(a) Define the
following terms.
(i) Catalytic
hydrogenation. (ii) Heat
of hydrogenation.
(b) The catalyst
employed in the above process is Raney Nickel. How is it prepared?
(c) Explain
the following statement ''The extent of stability of benezene can
be measured by comparing
it with hypothetical compound 1, 3, 5, cyclohexatriene. This can
be done by
estimating their heats of hydrogenation''.
(d) Write equations
for the following reactions with their specific catalysts and conditions.
(i) 3 Methyl-1-butene
into iso-pentane.
(ii) Hardening
of oil in industry.
(iii) 2 Butyne
into cis-butene.
(iv) 2 Butyne
into trans-butene |
